Air intake apparatus for a four-cycle internal combustion engine

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EP 0 867 608 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	21.07.1999 Bulletin 1999/29

(43)	Date of publication A2:
	30.09.1998 Bulletin 1998/40

(21)	Application number: 98105656.7

(22)	Date of filing: 27.03.1998

(51)	International Patent Classification (IPC)⁶: F02D 9/02

(84)	Designated Contracting States:
	AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

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Priority:

27.03.1997 JP 75819/97
30.05.1997 JP 142313/97
03.07.1997 JP 178510/97
14.07.1997 JP 188143/97

(71)	Applicant: YAMAHA HATSUDOKI KABUSHIKI KAISHA
	Iwata-shi Shizuoka-ken, 438 (JP)

(72)	Inventors:
	Hagasaka, Hideaki Iwata-shi, Shizuoka-ken (JP) Samoto, Haruhiko Iwata-shi, Shizuoka-ken (JP) Yashiro, Yoshinobu Iwata-shi, Shizuoka-ken (JP) Higaki, Yoshiyuki Iwata-shi, Shizuoka-ken (JP) Sano, Fumimoto Iwata-shi, Shizuoka-ken (JP)

(74)	Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät
	Maximilianstrasse 58 80538 München 80538 München (DE)

(54)	Air intake apparatus for a four-cycle internal combustion engine

(57) An air intake apparatus for a four-cycle internal combustion engine comprises air intake passages passing into at least one combustion chamber and throttle valves disposed in said air intake passages. Fuel injection valves are provided in close proximity to the throttle valve in the air intake passage, and at least one damping valve being arranged upstream of the throttle valve to vary the cross section of said air intake passages according to the air intake conditions, and to dampen increased air intake flows resulting from the aperture of the foregoing throttle valve.

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